That's doable, but you'll need to export the map in sections to accomplish that. I've done up to 200,000 x 200,000 that way.

I belive he did, see the URL near the end of his post.

Disabling delayed symbol drawing should fix it.

Type DELAYDRAWSYM on the command line and set it to 0 (Disabled)

Which ones you have installed can be checked via Tools -> Add Ons. (Only shows those that have been installed with the full year installer, so won't be listed if you have installed each issue individually).

That means it is an old map from before CC3+ (Or it was created from a flawed template that wasn't properly updated)

The default data file location was moved between CC3 and CC3+, and the # symbol refers to the installation directory, where the data files used to be kept. CC3+ has a fallback that it will be able to still display these files, but I guess the symbol import doesn't check this.

Fortunately, it is easy to fix, just run the FFIX command in your map to automatically convert the paths.