The Edimax EW-7811un would appear to be using the rtl8192cu firmware which is supposedly enabled as a kernel module since 25 March, and which would suggest a problem with the kernel module.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.
