Did Activision ever make any patches to fix bugs in any of the 3D Enhanced editions?
No, but fortunately the only bugs left are pretty minor (see the version pages for bug details). According to Activision, all the 3D Enhanced versions are already patched to v1.1 (the last PC revision). The one noticable issue is that the when the ATI version was first being included with the ATI 3D Rage (I) cards, it was released several months prior to the v1.1 patch release. So unless they were sitting on the patch for a while, this early ATI version may actually be only v1.0. The Macintosh RAVE version is already updated to v1.2 (same thing as v1.3 aside from the installer). If you go ahead and apply the patch to these games anyway, it will probably result in the game to crashing and forcing you to uninstall the whole thing. I’m not sure what would happen to the early ATI version (if it is actually only v1.0) and you patched it using the Pentium/Win95 v1.1 patch.