This update, SE decided to delete (as far as we can tell) many of the colors from the text palette that they weren't using. This results in many fewer colors for addons like Timestamp and Battlemod. If you were using a color code of 264 or higher, you will probably want to select a lower color.
They may also have changed colors 1-263, so you will also probably want to change your colors if you now find them boring.
In order to view available color codes, download the Battlemod addon from the Addons tab of the launcher and load it in game (//lua l battlemod). Then use //bm colortest. When done, you can unload it with //lua u battlemod.