*** glibc detected *** /usr/bin/mythbackend: free(): invalid next size (normal):
 0x0000000000c50520 ***
======= Backtrace: =========
/lib/libc.so.6[0x2b218aa5fe8d]
/lib/libc.so.6(__libc_free+0x76)[0x2b218aa614c6]
/usr/lib/libmythtv-0.20.so.0(_ZN12VideoBuffers13DeleteBuffersEv+0xcf)[0x2b21871c
9f9f]
/usr/lib/libmythtv-0.20.so.0(_ZN15VideoOutputNullD0Ev+0x5c)[0x2b21871c917c]
/usr/lib/libmythtv-0.20.so.0(_ZN17NuppelVideoPlayerD0Ev+0x1b3)[0x2b21870ec0e3]
/usr/lib/libmythtv-0.20.so.0(_ZN16PreviewGenerator13GetScreenGrabEPK11ProgramInf
oRK7QStringiRiS6_S6_Rf+0xd77)[0x2b2186f9a0f7]
/usr/bin/mythbackend[0x461ca5]
/usr/bin/mythbackend[0x4808cb]
/usr/bin/mythbackend[0x485870]
/usr/qt/3/lib/libqt-mt.so.3(_ZN15QThreadInstance5startEPv+0x6b)[0x2b21897ce05b]
/lib/libpthread.so.0[0x2b218a47e135]
/lib/libc.so.6(__clone+0x6d)[0x2b218aab33bd]