The error occurs with both pre-compiled deb package, and binaries built from source.
OS: Ubuntu 10.04
Steps to reproduce: Start xtrkcad, try any action, boom!
Xlib: extension "RANDR" missing on display ":0.0".
The program 'xtrkcad' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
(Details: serial 12729 error_code 8 request_code 151 minor_code 5)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
Altnernative: Running xtrkcad --sync, causes it to instantly crash
Note: stock xtrkcad 4.0.2 (no patches inside debian section) works without chrashing.