I tried the new version of TextMate (1.5.10, r1616). I noticed that there's a 'Changed' item on the Release notes stating that the keyboard shortcuts to change tabs are now the de facto standand Shift–Command–[ and ].
Now, whenever I have a tab with .tex file open and I try to browse through tabs TextMate executes Insert commands 'Command Based on Current Word' (Command–}) and 'Environment Based on Current Word' (Command–{) from the LaTeX bundle when changing to the next and previous tab, respectively.
So, what are my options to get the situation back to normal? I think I could disable the aforementioned commands from LaTeX bundle with the Bundle Editor, but with a quick look I didn't find them. Are there any other file types beside LaTeX that might cause problems with overlapping shortcuts? Is this overlapping of shortcuts a bug in TextMate? I guess there's no way to change the next/previous tab navigation commands. One obvious solution would be not to update to the latest version.
Best Answer
In moments, this update was driving me crazy. Luckily, I remembered that the Mac OS lets you customize keyboard shortcuts. So, I opened system preferences > keyboard > keyboard shortcuts --- and restored my textmate tab navigation to how they were previously! Yay!