Same as Mockford, was going to attempt a wipe and clean install but App Store purchase are back this morning.... looks like night helped
Mine simply reappeared this morning. Without me doing anything.
Give this man a Cigar, or internet Gold! This worked for me as well!!Solved for me. I had the same problem. I quit App Store, toggled my wireless connection off / on in the menu bar and then relaunched App Store. My previous purchases were there. I hope it works for others.