I'm Ed Hamrick, the author of VueScan, and I personally read and respond to support e-mail. Please note that we cannot offer telephone support.
About 80% of our support e-mails are requests to help find old registration info (i.e. e-mail address from the order form, serial number and customer number). You can get this info online by clicking here.
About 10% of our support e-mails are basically "Does XYZ scanner work with VueScan"? You can get this info online by clicking here.
About 5% our support e-mails are about technical problems with VueScan (Problem Reports). The most important thing we need to solve a problem is the vuescan.log file after the problem occurs. Click here to send a Problem Report with a vuescan.log file.
About 5% of our support e-mails are technical questions about scanners or about VueScan, and we only answer these questions when they're submitted in a Problem Report, and especially only if a vuescan.log file is submitted (you have to download and run VueScan before asking these kinds of questions. Click here to send a Problem Report with a vuescan.log file.
Some typical issues: