One of the most important tasks you need to remember after each major change (and before Magento upgrade) is to clean up your Magento cache.

1. Login to Admin Panel
2. Go to System Cache Management
3. Select all Cache Types, choose Refresh from the Action dropdown and click on Submit button
4. Click on Flush Magento Cache
5. Click on Flush Cache Storage
6. Click on Flush Catalog Images Cache
7. Click on Flush JavaScript/CSS Cache

Magento has pretty neat image helper you can use to output your product photos. Today one of my coworkers got frustrated with the white frame he kept getting around the resized image he tried to output in sidebar block. As s possible solution he tried resolving the issue with CSS. However, there is a better, more nicer solution to ditch the whit frame around resized images in Magento.