I've just noticed a couple of very odd things whilst trying to use various applications under fvwm on FreeBSD, and I thought that rather than just ignoring these, I should perhaps say something, in case they turn out to be actual bugs.
1) First, under fvwm, some certain applications, specifically evince and the chromium browser, display with any of the usual outer framing that fvwm seems to provide for all other X application programs, e.g. Xterm, xpdf, and the Firefox and Oprera browsers. I made an effort to see if these two applications (evince & chromium) exhibit the same issue when run under twm. They do not, in that case. When run under twm, they get an outer frame just like everything else. 2) The chromium browser, when run under fvwm, exhibits the strange property that, unlike all other X applications, if its window becomes partially hidden underneath another window, and if one then tries to foreground it again, by clicking on some visible part of it, it will not foreground. I also tried to see if I could reproduce this issue under twm, and in that case the problem/issue was not present, and chromium windows would foreground normally when some visible part was clicked on. That's all. Just thought that y'all might like to know.