The version 1.0.2 update has just gone live for Advanced Custom Tooltips, with vast improvements in terms of tooltip content formatting. Plugin users should be prompted to update through your WordPress admin panel soon.
By request, this version also adds an option to choose a custom color for your tooltip trigger text.
Also by request, a new knowledgebase article has gone up detailing how to achieve transparency in your tooltips.
Next up will be an editor button for adding tooltips into your posts more easily. Watch this space.