Hi,
Issues with third party products should be addressed to their developers. This forum is mainly for X-plane default install.
If possible, try to install the IXEG 737 on a clean second copy of X-plane (you can install one by running the installer and following the appropriate steps).
Also note that you can disable plugins from X-plane menu, so it often gives a possibility to try and isolate the guilty plugin. It could also be a combination of plugins not working well together.
XPLM is the plugin manager, so it does not give much information.
You could also try and find solutions on X-plane.org forum.
All the best with that,
Guillaume