I'm using TextMate Version 2.0 (9090) and found a minor but annoying bug. Steps to reproduce:

Open up a folder

Open two files (two tabs)

Highlight text in your current tab (should be bright highlighting)

Switch to other tab, switch back (now it will be dull highlighting)

To fix you just have to command-tab to a different app and back. Seems like changing tabs correctly dulls the tab you are changing from, but does not brighten the tab you are changing to. Keep up the good work!

Cheers,

Andrew