Build OK but runs only with valgrind

Hi There
I'v checked out latest MLT and KDEnlive (FFmpeg from opensuse repos).

mlt is 7.7, kdenlive is v0.8.2-270-g1988023

The build process is ok, but when i start kdenlive from command line i get this:

kdenlive: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
KCrash: Application 'kdenlive' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit

running KDEnlive from valgrind actually starts the software (very slowly)

What's that about?

Had to reinstall the OS from scratch. Followed again all the steps from the wiki and now it's running fine.