Hm-m-m ... I may be experiencing the same thing - or at least something similar.
I'm currently using MyInfo as a recording PIM. On a regular basis it whites out, and only time will revive it (five to fifteen minutes). At times, during this white-out, the screen cursor is totally immovable, but that normally lasts only a short period.
Diagnostics don't tell me anything, nor do any of the analysis softwares I've run. I've pretty well traced it down to MyInfo saving the open databases & making backups thereof. Still trying to analyze, so I disabled the automatic backups - has made a significant difference, but has not eliminated the problem. (I do get a not responding in the title bar.)
After the initial lockup (period variable), I can get to other software that is open, or even open new software. Eventually, MyInfo wakes up and everything seems kosher again. Dunno if any of this will help, but you might take a look at what the software is doing - or supposed to be doing - when the WSOD occurs.
Oh, this is on Win7 Ulitmate 64-bit, i7 CPU, 6.00 GB RAM, Toshiba Satellite laptop. MyInfo is, to the best of my knowledge, 32-bit.