I have the Thunder Beta installed as a standalone installation. I have also found this bug with Thunder installed as a plugin to Eclipse
Since using Thunder, I have noticed that my undo buffer is not working correctly.
I get around 25-30 undos before Eclipse will no longer undo anything further.
The undo history size setting defaults to something like 200 and I have tried upping it to 1000 to see if it helped.
It doesn't seem to matter what I do, but I can only undo 25 or so actions before I can not undo anything.
This happens with imported projects as well as new ones. Existing cfml/cfc files as well as newly created ones.