I have just this week received complaints from three different students taking different lessons who are all encountering a blank white screen when taking the lesson.
None of the lessons have been updated in a long time. So far the only common thread I am seeing is that they are all on Windows 7.
I am suspicious of the new flash player because I ran into a problem watching youtube videos last week for several days until I discovered how to turn off the hardware acceleration. I can't seem to recreate their problem.
I have remote logged into one of the computers and tried it on IE and downloaded Chrome as an alternative. I tried turning off hardware acceleration and it made now difference. For that student nothing worked.
For another student with a patient father, they couldn't get it to work at all in Firefox but could get it to work on Internet Explorer but on IE 9 it will work and then hang. If you add my site to trusted sites in IE9, they get the blank screen like firefox. If they turn that off they see the course until it hangs.
All 3 students were successfully using the course and then something happened that made it stop working. I am looking to see if anyone else has heard of this and has figured out what is going on.
I know that the flash player has changed recently but so far adjusting settings doesn't cause me to recreate the problem. Windows 7 is changing all the time.
If anyone has insight or advise, please let me know. I am stumped.