When using "1g" to go back from the last page to the first one, I got the following message and mgp exited: internal error: XClearPixmap() I guess mgp should call abort() in such conditions, so that more info can be provided. Page 1 here is the only one with an (X11 bitmap) image. Cannot reproduce. If bug can't be found by just looking at the source, I'd consider adding assertions at the relevant places to be sufficient to close this report.
This bug has been forwarded to mgp-users-jp 00661 http://www.mew.org/archive/mgp-users-jp/A/msg00657.html