Hello Bob,
I've been trying to make my PhD 3 fall over, to try to replicate your crash, but I can't.
I've imported up to 599 photos, a mixture of RAW & JPEG files, deleted files in groups of up to 50... all without a hitch. To further test the import process, I was importing from an external (USB) drive.
You would have noticed, after/during import of large numbers of images, that it takes PhD a while to render. There's a fairly insignificant render progress bar in the top right corner. During that rendering process, right click > delete/remove from album is disabled (greyed out).
N.B. My most recent import of 345 photos has been sitting at 99% rendering the whole time I've been typing this.
I'm only guessing, because I'm unable to replicate the issue here, that there may have been some interference between the concurrent rendering & deleting processes (and possibly related to the other program you were using).
Prior to installing PhD 3, I completely removed the Beta version using Revo Uninstaller to clear any registry footprint). That was possibly unnecesary, but I like to start with a clean slate (so to speak).
If I get it to fall over, you'll be the firsat to know!
PIX
PIX YouTube channel