Same here AKM lost 75 drum and the one in backpack was gone. AK101 w/ 30 mag was ok, as was the MP5 w/ 30 mag

I had the same issue, tried 4 pc's b4 I got on. Found my firewall was blocking internet for DayZ servers after 0.55 patch. I changed to allow access and it is working on all pc's now.