Since about between 29.04. 19:30 and 30.04. 06:44 (CEST) several features on
de.wikisource have been halted to function.
See "Bug 48182".
A particularly disturbing effect is the missing previous- and next-Button in "single page mode" (e.g. http://de.wikisource.org/wiki/Seite:FrancesKuelpeRoteTage.pdf/239). When you have edit and save, you can not (without long way round) to next page, for usability is it a disaster.
There are still some other bugs since the last update, please try to resolve some of them. We want back to "good old times"!