Had an issue with the JaxonzRenamer.esp as part of a merge/load order (repeated access violations, command prompt crashing during script copy sequences, etc) with MergePlugins reporting that the plugin had a lot of unresolved form IDs in the script until I finally opened it up in TES5Edit and had a look. TURNS OUT it didn't have Skyrim.esm listed as a master (or indeed did it have a 'masters' section); adding it manually fixed all reported errors, and allowed the merge to proceed without issue. Thought it worth mentioning as a warning in case anyone else runs into a similar problem. Why someone would release a plugin with no masters listed I have no idea, but apparently it has happened at least the one time and it causes all KINDS of headaches. Submitted this report to the user dictionary as well. Hope it helps.