Version: (using Devel) OS: Linux Installed from: Compiled sources Look at the attached screenshot. I don't know why this happened... Plasma crashed yesterday but I couldn't get a good backtrace. It came back without those miniapplets. Today I logged in again and found the applets like you can see in the screenie. I was able to fix it by clicking with the right mouse button using "unlock miniapplets" (translation from German).
Created attachment 29821 [details] Wrong layout
What is your KDE version / SVN revision ? This is probably related/duplicate of bug 177968
KDE 4.1.86 (KDE 4.2 >= 20081221) So not young enough if that is the bug 177968 (fixed on Dec 27).
disappearance of added widgets after an eventual crash was also fixed recently. *** This bug has been marked as a duplicate of bug 177968 ***