After the patch, my Silverwastes track was switched to Crucible of Eternity (I found this out after completing a match), even though I never switched it off. When I switched it back and closed the pane, i was still earning for Crucible, and when i opened the pane, it had switched back. I tried the Maguuma track, and it worked fine, then tried switching to Silverwastes. When i closed the pane, it reverted to Magumma.
In short: After patch, when i try to switch from any track to silverwastes, my choice is reverted to the previous track upon closing the pane. This is only with the silverwastes track (i’m 34/40, and had no problems prior to patch).