( CNN ) -- Apple says it has fixed a glitch that was causing apps downloaded from its online store to crash this week . `` We had a temporary issue that began yesterday with a server that generated DRM code for some apps being downloaded , '' Apple spokeswoman Trudy Muller said . `` It affected a small number of users . The issue has been rectified and we do n't expect it to occur again . '' `` DRM '' stands for `` digital rights management , '' the system that gives a user access to copyrighted content . Users who had trouble launching an app can delete and download it again , Muller said . The problem came to light Wednesday when Marco Arment , the creator of mobile app Instapaper , blogged and tweeted that an update to that app was crashing and fading to black immediately after people downloaded it . He documented more than 100 apps that also appeared to be having the same problem , including `` Angry Birds , '' Huffington and GoodReader , before saying it was getting too hard to keep up with complaints that were coming in . In the interim , GoodReader had issued a 24-step procedure to work around the problem . The glitch was impacting apps for the mobile operating system that runs iPhones and iPads as well as apps for Macs .
Apple says Friday a glitch causing apps to crash has been fixed . Problem was noted by creator of the app Instapaper . Users can delete , then re-install , affected apps .