Xing has just updated it's image-thumbnails naming "algorithm" once again:
You'll now find thumbnails named /2f1127fe2.3144098_s2,2.jpg, so including another component like <comma><digit> added to the name. Thus the Greasemonkey script linked from my article Greasemonkey to enlarge Xing pictures needs to have it's main regex amended:
Change \_s(1|2|3)?\. to read \_s(1|2|3)?(,\d)?\. in three places in the script.
Or download an updated version here. I hope "louis" will update the version hosted at userscripts.org, too.
02.05.2008 As Xing adds multi-digit numbers to the thumbnails now (like /7553bd445.4550412_s2,10.jpg), you need to replace \d with \d+ in the above regex. The linked Greasemonkey script is updated.
16.11.2011 And again the URLs changed. This time appending a pattern like ,4.57x75.jpg. The linked script again was updated. If Scriptish and the auto-updating in Greasemonkey mature, I'll add auto-updating to the script file via the @updateURL parameter.
13.05.2012 The Xing layout is still changing as they Ajaxify the site more and more. Currently the Xing XE is probably the best working enhancement to see Xing pictures in a recognisable size.