Redmine

Apparently posting this as a "defect" was a bad thing so here it is:
Hopefully I can get some support on this from anyone here since my other topic that I posted here had zero replies and posting it as a defect gets it closed out immediately without questions.

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I am getting an error whenever I try to delete issues.

Internal error

An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.

If you are the Redmine administrator, check your log files for details about the error.

Back

Here is what happens in the log.

Started DELETE "/issues/69" for 127.0.0.1 at 2014-02-07 15:24:20 -0800
Processing by IssuesController#destroy as HTML
Parameters: {"authenticity_token"=>"YqMTDOir6KSSNrAKGjMihlJUaGq85X4V+zZrNtenQ+Y=", "id"=>"69"}
Current user: jsh562 (id=3)
Completed 500 Internal Server Error in 20.0ms

SystemStackError (stack level too deep):
activesupport (3.2.16) lib/active_support/callbacks.rb:409

- Redmine
2.4.x
- Ruby implementation and version
ruby 1.9.3p484
- Rails version (rails --version)
rails 3.2.16
- Operating system (precise if you're using cygwin when running on Windows)
win 7
- Database used, and its version
mysql 5.6
- Ruby-aware server used: Webrick, Mongrel, Thin, etc. If you don't understand this point, you're using Webrick.
Thin

Some recent changes:

• I have done some editing in the database backend side. Including deleting an entry as well as editing a value. Redmine worked fine after these changes.
• I have tried installing plugins and after failing to initialize some of them and/or with some of them causing internal errors, I uninstalled them.

After these changes and after seeing redmine fail at deleting an issue, I tried:

• reinstalling ruby
• replacing all redmine files with extracted contents

I have seen some "similar" "defects" posted but none of them helps solve my issue.

So any help would be much appreciated.

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EDIT:
I have done re-installations of redmine onto this exact machine more than 3 times before with everything working as expected. Now, even re-installations aren't getting rid of the problem.

More recent changes:

I tried a fresh re-installation of redmine/ruby + restoring database from old date.

Same error on issue deletion.

I just tried a fresh installation of redmine/ruby + new redmine database + rake db:migrate

Same error on issue deletion.

Started DELETE "/issues/1" for 127.0.0.1 at 2014-02-10 09:28:14 -0800
Processing by IssuesController#destroy as HTML
Parameters: {"authenticity_token"=>"vjSSyg85bDFaoT4rC5ozHKYyO3E1Fn9Ei2oKxmq+mSM=", "id"=>"1"}
Current user: admin (id=1)
Completed 500 Internal Server Error in 43.0ms

SystemStackError (stack level too deep):
activesupport (3.2.16) lib/active_support/callbacks.rb:409

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EDIT:

• Ruled out Thin by trying both Thin and Webrick
• Ruled out database data by trying to restore from 2 older sources (of known data integrity) and by trying a completely fresh blank (but initialized) redmine database.