Some TWAIN drivers for Plustek scanners, for example, version 5.2.0.0 of TWAIN driver for Windows 8.1 for Plustek PS286 Plus (
http://plustek.com/*-of ... s286-plus/), have critical bug - driver can be used only by the application, which filename (without extension) has 15 symbols or less. For example, driver will work with your application if your application has filename "123456789012345.exe" (filename length is 15 symbols) but driver will raise an exception if your application has filename "1234567890123456.exe" (filename length is 16 symbols).
Hope, Plustek will fix bug in their drivers in near time.