i have no idea what possessed you to make a whole separate topic of your own when theres a bigwigs thread already or to give it a massive title but it doesn't give a nice first impression or motivation to help you.
try deleting all your bigwigs folders and re-install it with wau 1.7
The suggestion to delete all BigWigs folders and then use WAU 1.7 to install fixed the issue.
For reference, here is the troubleshooting i did before I reported the issue here:
1. Delete WDB and WTF folders, reinstall all mods.
2. Same as above but this time remove any bigwigs files from Savedvariables subfolders. No Impact.
3. Same as above + deselect and reslect all chat channels, and select 'simple chat' in interface options. No impact
4. Remove all mods. Problem then resolved.
5. Gradually introduce mods a few at a time until problem recurred.
Using this approach I narrowed it down to bigwigs.
6. Reinstalled bigwigs mod. No impact
7. Looked for all ACE2 mods and downloaded / installed latest version. No impact. (I wonder if I may have missed 1 or 2 and that was remedied by using WAU - I wasn't aware of WAU before the suggestion to use it was made.)
Many thanks for your help guys. Happy the issue seems now to be resolved.
Great work on producing the excellent mod by the way :)