No bug report yet, since I haven't played with the 2D scape for a looong while
But it is in essence this:
I find the 2D one not nearly as useful, and a bit buggy. Framerate drops to 2-3 FPS sometimes when using it after reading UFOPedia, sort of like the "Cyrillic UFOPedia" bug.
It happened to me with the 2.2 release, if I tried to read all the initial emails at once. If I read one, then went back to the Geoscape, then read another, etc, it was less likely to become unstable. But, since I noticed the 3D one was not affected by the bug, AND much more useful, AND cooler-looking
I stopped bothering with the 2D one and never filed a report.
I'll look into filing a bug for this...