I was just working on a branch that I branched off of the 13197 bugfix branch, and I noticed that every time I try to save a module, even a "new module", I get a "couldn't write the file" error and it just leaves the tmp1234123413.zip file.
And I thought "that's odd, doesn't *seem* related to anything I've just done".
So I pulled down "master" itself and tried creating a "new module" and Save-As-ing it -- FAIL.
Also the message it puts up is weird, it acts like it can't write the TMP file even though it looks like it's failing to rename it to vmod.
So anyway there you have it.
Brian