I have several websites running WordPress 3.8.1, using three different hosting services. What occurs is on upload of seemingly any image - I've tested a smattering of sizes - the image appears to upload, gets to the "crunching" part then nothing further happens, no matter how long I wait. The next page with the thumbnail and "Edit" link never appear. Further, the resized versions are never created. Consequently, the image is pretty much unusable in any fashion the direct link to the image gives a 404 error.
I've tried several "fixes" to no avail, gone plain vanilla, no plugins and the 20-14 theme, bumped the memory in the wp-config file all to no avail. The problem seemed to start with the 3.8.1 upgrade, however, at least one site is still at 3.8 and exhibits the same problem - I may have not noticed it in 3.8.
The common denominator is the hosting service, the problem is only occurring on the sites that are hosted with 1and1, all the others are fine. Using the "TPC! Memory Usage" plugin, I've discovered that 1and1 is using MySQL v5.1.73 - whereas the others are using v5.5.36. PHP versions are the same, save for one of the hosting services which is at 5.3.13 vs 5.4 on the others - but the older php version does not exhibit the issue.
Need help on this as the problem turned up just as we were bout to go live with the newest site.
[Moderator Note: No bumping, thank you.]