Problem: When starting LGM with a new file, the default GM6 settings take place, meaning that there is no Extension Packages tree node. If you then attempt to save as a GM8 (800, gmk) file, the tree node is still not added, causing the file to be one tree node short. I'm not sure if this confuses GM.
Workaround: There is no workaround to this short of adding a plugin or directly modifying LGM's source code to add an additional tree node.
Proposed solution: Initialize LGM as a crosswalk and include the Extension Packages treenode. Optionally omit the node when saving as GM6.
Auxiliary: Implement Extension Packages. Apply icon.
useradd
more /root/Bugs/Extension Package treenode not added to GM8.thread
r454 adds the node to the tree, essentially initializing LGM as a crosswalk. Deeper Extension Package support is still needed.