I have seen too that Zview crash before quit, this is true now I try to remember I never find why, it is possible that it is when unload ldg, personnaly as I not unload ldg with this function for my application I never see it. I can try to find this bug in some days.
I know where the bug is I just don't know why it happens, it seems like incorrect allocation in the first place, ldg_unload:
if( ldg) {
if( ldg->close) (*ldg->close)();
Mfree( ((BASPAG *)ldg->baspag)->p_env);
Mfree( ldg->baspag);
ldg->baspag = NULL;
}
crash occurs on the last line, ldg->baspage = NULL (!), if I comment this out, everything is OK. It seems that Mfree() frees more than it should (i.e. freeing also the memory where 'ldg' points to)