install Seaside in Squeak5.2:
<path to SmalltalkCI>/run.sh --headful -s Squeak-5.2 <path to Seaside>/.smalltalk.ston
Run the test WAPharoDebuggerTest>>testNamedTempAt and you'll see a debugger pop up for an UndeclaredVariable. The source lookup is performed in the changes file but in the middle of a chunk of binary (font) data.
I can can only speculate that some of that binary data introduces random chunks which messes with the offsets.
We're adding a workaround for that particular test for now.