If you see the following error(s) in your system.log:
This seems to be a bug in Magento 1.5.1.0. You will need to change the value at line 163 in
Existing Code:
elseif (false !== $transparentIndex) {
Correct Code:
elseif (false !== $transparentIndex && $transparentIndex >= 0 && $transparentIndex < 255) {
If you are a Create Hosting customer on the Magento Hosting Plan, feel free to submit a support ticket and we can take care of this issue for you.