Using Kee in multiple browsers (Chrome and Firefox), only one works at any given time

I’ve released KeePassRPC 1.9 now:

Please can you test with this version to see if it resolves the problem. If it doesn’t, some extra debug logging from KeePass may provide us some further clues.

@Lex, your problem is not related to this topic. Please make sure you update to Kee 3.1 and KeePassRPC 1.9 and follow the latest advice in the troubleshooting guide and other documentation / topics on this forum. If none of that helps you, please start a new topic with all the details of your current problem.