@misiak - the same one the stock tklock uses - hildon_gtk_(v/h)scale_new. I guess the problem lies either here https://gitorious.org/community-ssu/...ock.c#line1116 or here https://gitorious.org/community-ssu/...ock.c#line1146

Fortunately it is very easy to build tklock with traces, so the function to blame will be pointed easily