How can we re-install the „Regular Price“ which is displayed in the frontend?
We deleted the “Regular Price” at the source code.
Unfortunately Magento changes the wholesale prices (at Frontend!) and we don´t know why.
We suppose and hope, that this is because we deleted the regular price option.
That´s why we want to try to re-install and check.
Do you have version controlled installed? You can just look at the history of the code changes and revert easily?
If not, I would say the next course of action is to put a clean copy of Magento over your code to change out any core rewrites you have done.