diff --git a/.devcontainer/docker-compose.yml b/.devcontainer/docker-compose.yml
index 58085c3..a6a2a50 100644
--- a/.devcontainer/docker-compose.yml
+++ b/.devcontainer/docker-compose.yml
@@ -1,8 +1,7 @@
 services:
   app:
-    image: ghcr.io/ximeraproject/ximeralatex:v2.5.5
-    # image: ghcr.io/ximeraproject/ximeralatex:v2.5.5-full
-    # image: ghcr.io/ximeraproject/xake2024:v2.4.3-full
+    image: ghcr.io/ximeraproject/ximeralatex:v2.5.8
+    # image: ghcr.io/ximeraproject/ximeralatex:v2.5.8-full
     volumes:
       # This is where VS Code should expect to find your project's source code and the value of "workspaceFolder" in .devcontainer/devcontainer.json
       - ..:/code:cached
diff --git a/.github/workflows/serve-ximera.yml b/.github/workflows/serve-ximera.yml
index 74a4561..534648f 100644
--- a/.github/workflows/serve-ximera.yml
+++ b/.github/workflows/serve-ximera.yml
@@ -1,12 +1,11 @@
-name: Build and publish a Ximera repo
+name: Ximera Workflow
 
 on:
-  push:
-    branches:
-      - master
+  push:      
 
 jobs:
   build-ximera:
+    name: Build and preview Ximera Courses
     runs-on: ubuntu-latest
 
     permissions:
@@ -33,16 +32,61 @@ jobs:
             !xmPictures/**
             !.git/**
             !.github/**
-          key: ximera-buildx-${{ github.sha }}
+          key: ximera-${{ github.ref_name }}-${{ github.sha }}
           restore-keys: |
-            ximera-buildx-
+            ximera-${{ github.ref_name }}-
             ximera-
 
+
       - name: Build and publish Ximera courses
         env:
           GPG_KEY: ${{ secrets.GPG_KEY }}
           GPG_KEY_ID: ${{ secrets.GPG_KEY_ID }}
-          XIMERA_NAME: uccalc
-          XIMERA_URL: https://ximera.osu.edu/
+          XIMERA_URL: ${{ vars.XIMERA_URL }}
+          XIMERA_NAME: ${{ vars.XIMERA_NAME }}*${{ github.ref_name }}
         run: |
+          ls -alrt
           ./xmScripts/xmlatex ghaction
+          echo "✅ Published to $XIMERA_URL$XIMERA_NAME " >> $GITHUB_STEP_SUMMARY
+
+      - name: Setup ximera serve cache (only .git)
+        id: serve-cache
+        uses: actions/cache/save@v4
+        with:
+          path: | 
+            xmScripts/**
+            .git/**
+          key: ximeraSERVE-${{ github.ref_name }}-${{ github.sha }}
+
+
+  publish-ximera:
+    name: Publish Ximera Courses
+    needs: build-ximera # Waits for the build job to complete
+    runs-on: ubuntu-latest
+    environment: production
+    steps:
+
+
+      - name: Restore ximera serve cache (only .git)
+        id: serve-cache-restore
+        uses: actions/cache/restore@v4
+        with:
+          fail-on-cache-miss: true
+          path: | 
+            xmScripts/**
+            .git/**
+          key: ximeraSERVE-${{ github.ref_name }}-${{ github.sha }}
+          
+      - name: Serve
+        env:
+          GPG_KEY: ${{ secrets.GPG_KEY }}
+          GPG_KEY_ID: ${{ secrets.GPG_KEY_ID }}
+          XIMERA_URL: ${{ vars.XIMERA_URL }}
+          XIMERA_NAME: ${{ vars.XIMERA_NAME }}
+        run: |
+          ./xmScripts/xmlatex name         
+          ./xmScripts/xmlatex serve -f  # NOTE: -f  should not be needed ...        
+          echo "✅ Published to $XIMERA_URL$XIMERA_NAME " >> $GITHUB_STEP_SUMMARY
+
+
+
diff --git a/derivativeRules/derivativeRules.tex b/derivativeRules/derivativeRules.tex
index b4bfb53..1cee66a 100644
--- a/derivativeRules/derivativeRules.tex
+++ b/derivativeRules/derivativeRules.tex
@@ -9,6 +9,15 @@
 \end{abstract}
 \maketitle
 
+
+% HACK: in ximeralatex v2.5.5, TeX4HTis configured to use luatex, 
+% and pictures-with-luatex somehow redefine \d so that \d x becomes x-underdot  (presumable at \BeginDocument or so)
+% This is only a problem when using \d inside a tikzpicture
+% TEMPORARY FIX: redefine it once more
+% (in this case, anothjer fix might be to remove the \tikzpicture: it does not seem to be needed (anymore?) to get the formatting correct)
+% TODO: implement a better solution
+\renewcommand{\d}{\mathop{}\!d}
+
 Here are a few derivatives we may have calculated using the definition (all of them can be verified with a factoring limit - try it!)
 
 {  \renewcommand*{\arraystretch}{1.3}
@@ -108,10 +117,10 @@ \section{The constant rule}
   the tangent line is $0$.
 \item If $s(t)$ represents the position of an object with respect to
   time and $s(t)$ is constant, then the object is not moving, so its
-  velocity is zero. Hence $\dd{t} s(t) = 0$.
+  velocity is zero. Hence $\ddt s(t) = 0$.
 \item If $v(t)$ represents the velocity of an object with respect to
   time and $v(t)$ is constant, then the object's acceleration is
-  zero. Hence $\dd{t} v(t) = 0$.
+  zero. Hence $\ddt v(t) = 0$.
 \end{itemize}
 The examples above lead us to our next theorem.
 To gain intuition, you should compute the derivative of
diff --git a/global.css b/global.css
index 134274a..5243093 100644
--- a/global.css
+++ b/global.css
@@ -1047,4 +1047,16 @@ span#prev-activity-label {
 /* fix \begin{center} for tabular; to be done properly...) */
 div.center > .tabular {
     margin: auto;
+}
+
+
+/* OVERWRITE 'explanation' */
+.explanation::before {
+	content: "Explanation: ";
+}
+
+.explanation, .explanation-content {	
+  background-color: transparent;
+  border: none;
+  border-left: none;
 }
\ No newline at end of file
diff --git a/test.tex b/test.tex
index a569610..f67ffbf 100644
--- a/test.tex
+++ b/test.tex
@@ -2,7 +2,7 @@
 
 \usepgfplotslibrary{fillbetween}  % needed in areaBetweenCurves
 
-\title{CalculusIA and Calculus IB}
+\title{Dummy test course}
 \input{preamble.tex}
 \begin{document}
 \begin{abstract}\end{abstract}
diff --git a/xmScripts/config.txt b/xmScripts/config.txt
index 5563e86..9ad5d7e 100644
--- a/xmScripts/config.txt
+++ b/xmScripts/config.txt
@@ -2,8 +2,7 @@
 # version of Ximera xake container to use (with xmlatex)
 #
 # : "${XAKE_BASE:=ximeralatex}"
-: "${XAKE_VERSION:=v2.5.5-full}"
-
+: "${XAKE_VERSION:=v2.5.8}"
 #
 #
 # For publishing locally, a default key in .xmKeyFile is sufficient.