Background Processing is not available under KSP 1.1. Unless the mod author updates it soon I will look to put my own EC background processing
into DeepFreeze. For now if you are using EC usage the non-Background Processing method still works (it plays catch-up when you swith to the vessel).
There is no version of TAC LS for KSP 1.1 - so it is not currently supported.

Forked version made available.