Hi Rick,
Recoverable errors are overcome by the project loading routines automatically. Unrecoverable errors cannot be ignored, since they are caused by malformed XML source code or inconsistencies that would compromise the whole platform.
A checksum error means that one of the project data files (on the ".data" project folder) has been modified since the project was saved. You can "ignore" these problems by simply removing the checksum from the XML code. For example:
<image src="@project_data_dir/UCGGY8P5U-000001" sha1="bb8ed859dfdfcc092246d010f86b7e2b9fb225de"/>
If you remove the sha1 attribute (marked as red text), the project loader won't verify the integrity of the image in question. Bear in mind that this may lead to further errors if the image is inconsistent with other project items.