Since instaling the critical patch, I must have done something wrong and the catalogue tab has dissappeared from the dashboard, so i can add/amend any of the products. Has anyone else had this problem or does someone know how to fix this? Any help will be most welcomed.
Check that your "js" folder off of your public html directory has correct permissions, and that no js files are missing. This can cause issues with admin display sometimes.
Also use developer mode in your browser (press f12), and check console tab when reloading the main admin page to see if any JS errors appear.
Also clear the Magento cache to make sure no old cached files are interfering.
A patch, if installed correctly, should not cause this behavior.