Selecting Fixtures doesn't work always right

[MTF Showtechnic]

OK I'll go back to the current version 7.1.54 and have a try.
This afternoon we'll work in a theater with current version.
Feedback asap.
greetings

[Pink LD]

When this behaviour happens I have done all of the following to no avail, hence I restart the programme:
- Try to select in 2D not on a fixture to clear current selection, no deal.
- ctrl+mouse click or deselect fixtures, no deal.
- shift+mouse click for a group of fixtures, no deal.
- And sometimes when I do select fixtures in 2D the selections do no show up on the channels. Editor just stays showing channels 1-512.

The next time it does it and before I restart the programme I'll get video of it.