I'm afraid these traces are trimmed down too much, I can't replay them:

0 @2 glBindBufferARB(target = GL_ARRAY_BUFFER, buffer = 17)
0: warning: no current context
1 @2 glMapBufferRange(target = GL_ELEMENT_ARRAY_BUFFER, offset = 0, length =
20480, access = GL_MAP_READ_BIT | GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT)
= 0xee18d000
1: warning: no current context
glretrace: ../retrace/retrace_swizzle.cpp:137: void retrace::addRegion(long
long unsigned int, void*, long long unsigned int): Assertion `buffer' failed.