RapidWeaver keeps crashing

I have RapidWeaver 6.3.7. It keeps crashing without warning when I am doing nothing. If I have not saved what I have been working on, I lose it. This appears to be happening on only one of my three sites. At first I thought it might be because I had inserted a cssslider file on one page, but another site also has a cssslider insert and is not affected.
Iā€™m afraid I have no clues to clarify this behaviour and am hoping someone else has experienced something similar.

Actually, a second of my sites just crashed.

RapidWeaver 6.3.8 is out, I would get it from here
and not from updating, as some people who have had crashes have had issues just by updating RapidWeaver.

I have downloaded 6.3.8 and it appears the problem is solved. (I tried checking for updates in 6.3.7 but nothing happened!)