How to reproduce: - Start PV, make sure only one empty session exists. - Open the file dcf77_480s_pon_interrupted.sr from sigrok-dumps (quite large, will take a while to load). - While the file is still loading and the Run icon is green, click "x" to close the session. - There are no sessions anymore now, but the Run button is still green. It should be gray.
Fixed in ae1b6126c9a4e40ad2832e2b2e776f3a4a62e195, thanks!