In 7.5.8, the UBB.Threads developers changed the way "Spider-Friendly URLs" were generated. That change caused several problems.

1. Search engine indexing problems caused by multiple "?", "&", "/" and other special characters in the URL

EXAMPLE: https://www.ubbcentral.com/forums/ubbthreads.php/topics/255499/?_/&/?%3E%22&+?&am
The link should take you to here, but it does not parse in UBBT 7.5.8.


2. Problems with how UBBT 7.5.8 determines if a line of text is just text or if it's actually URL and should be treated as a URL due to the special characters being placed in the URLs.

This link has braces ( [ and ] ) in it, but UBBT 7.5.8 doesnt know how to parse it, so it treats only part of it as a URL or ignores the whole thing entirely, just as UBBT 7.5.8 ignored the url strings in item #1 as being a link.
https://www.ubbdev.com/forums/ubbthreads.php/topics/318145/%5B7.x%5D_Google_Adsense_Search.html
https://www.ubbdev.com/forums/ubbthreads.php/topics/318145/[7.x]_Google_Adsense_Search.html


3. Generating "duplicate content" flags are raised in Google's Webmaster Tools dashboard because of the URL change in all your topics, but the content remaining the same. Its not incredibly horrible as relating to Google's search engine and their advanced content tools, but other spiders may flag you and down-rank your pages because of it.

Read more on this at:
http://googlewebmastercentral.blogspot.no/2008/09/demystifying-duplicate-content-penalty.html


4. Possible login Cookie problems for Internet Explorer 7 and older.
https://www.ubbcentral.com/forums/ubbthreads.php/topics/255498/Re:_"Remember_me_on_e#Post255498

AGAIN, the URL doesnt get parsed correctly because of the quotes (") in it.
The manually-corrected URL is: https://www.ubbcentral.com/forums/ubbthreads.php/topics/255498#Post255498

Using the instructions to fix UBBT 7.5.8's URL bug -- at the bottom of this post -- the copy/pasted link would be parsed correctly and would look like:
https://www.ubbcentral.com/forums/u...osing-user-login-status-in-ie#Post255498


5. In addition, here is some further reading on the use of hyphens (-) vs underscores (_):
SOURCE: http://www.ecreativeim.com/blog/2011/03/seo-basics-hyphen-or-underscore-for-seo-urls/

Quote
The short answer is that you should use a hyphen for your SEO URLs. Google treats a hyphen as a word separator, but does not treat an underscore that way. Google treats and underscore as a word joiner — so red_sneakers is the same as redsneakers to Google. This has been confirmed directly by Google themselves, including the fact that using dashes over underscores will have a (minor) ranking benefit.

Again, SEO URLs should use hyphens to separate words. Do not use underscores, do not try to use spaces, and do not smash all the words together intoonebigword. As of 2012, dashes are still the best way to optimize your SEO URLs.

A video answering the hyphen vs underscore SEO URL question by Matt Cutts.
Matthew "Matt" Cutts leads the Webspam team at Google, and works with the search quality team on search engine optimization issues

Regarding the video; since your pages are now formatted differently ("brand new") with UBBT 7.5.8's "SEO-friendly" URLs, they should be using hyphens (-) rather than underscores (_).


6. Since UBBT 7.5.8, here are some other characters that get placed in the URL which should not be there:
? > < " & + | ! % # \ ^ { } = : ; @ $


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How to fix all six items listed above:
https://www.ubbdev.com/forums/ubbthreads.php/topics/319241



Current developer of UBB.threads PHP Forum Software
Current Release: UBBT 7.7.5 // Preview: UBBT 8.0.0
isaac @ id242.com // my forum @ CelicaHobby.com