Installed RC3 just now and experienced some crashes that I think may be related.
So, I installed RC3. Started it. It starts retagging the workspace I'd left open when I closed down RC2 before installation. Sees a bunch of messages about "invalid index block" or some such thing. After 5-10 seconds windbg pops up with an heap corruption problem. I save a large process dump and a small process dump (attached as heap-corruption-mini.zip), then closes the debugger and thereby SlickEdit.
Start SlickEdit again (still RC3 ofc). Crashes with an invalid pointer access in less than 2 seconds after I see the SlickEdit window. Small dump attached as invalid-pointer-crash-mini.zip.
Started the gflags.exe utility that ships with windbg and enabled the paged heap for vs.exe. Start vs and it crashes after a short while inside tagsdb.dll, small dump attached as paged-heap-corruption-mini.zip.
I hope you can make some sense of these issues dumps. If you need dumps with all memory included, I have those handy as well.
--bird
PS. After I recreated the workspace from scratch (delete everything associated with it) and restarted slickedit, it seems to work a bit better, even with the paged heap still enabled.