Many third-party AutoCAD plugins (vertical add-ons for architecture, civil, MEP) hook into the vl-load-com function. If a third-party plugin loads a different version of a shared library (like MFC or C++ runtimes), it can cause vl.crx to fail.
To isolate the specific cause, a binary search approach (process of elimination) is recommended. autocad exception in vl.crx arx command