I've had this once too.
Typing into the textbox does not update the display, however the characters are being stored, since when you click the Find button, suddenly all the text you typed appears in the textbox. Its a stange bug
On 21/11/2014, Anand Ramanathan email@example.com wrote:
I am finding that the Find in Project window stops responding (I cannot type in the Find: field, though I can click checkboxes, etc.). This started happening quite recently, I currently have Textmate v2 beta 6.