I am aware of this thread which may be related to my issue http://ellislab.com/forums/viewthread/196920/, but I don’t see a solution.
In my case, when on a entry form in the CP if you click on Add File, close the upload window, then click on Add File again nothing happens (the upload window does not appear again). This appears to have started after updating to the latest build (2.2.2 20110801). I have attempted to recreate the problem on a local install, with no success. I have also updated all other add-ons to current versions on the site where the problem is occurring.
I’ve tested with same results in FF 5.0.1 and Safari 5.0.5 on Mac.
More related to the thread I noted above, neither the the files nor the list/thumbnails view dropdown appear in the upload window when it does appear (on first click).
Any suggestions for troubleshooting?