1. Sometimes when I set a normal line breakpoint, the breakpoint tooltip appears immediately with a red 'invalid breakpoint' error line in it. The breakpoint is actually OK and works as normal. When I mouseover it subsequently, the error line is gone from the tooltip. I'm not sure of the exact circumstances, as it's always unexpected, but it seems to sometimes happen the first time I set a breakpoint in a file - subsequent breakpoints set normally.
2. I noticed today that the squiggly red line under the file name on the editor tab, that appears when there is an error in the file, sometimes doesn't go away when the error is fixed, even after it has compiled successfully and F2 and the gutter show no errors. I had to close and reopen a file today to make this error line go away.
DL> breakpoint in a file - subsequent breakpoints set normally.
If you can reproduce it, please file a JIRA request.
DL> close and reopen a file today to make this error line go away.
5692, but if it didn't, it will appear in the next EAP build.