We have include pdfcreator in a erp system, but we have several client with all the same problem:
after analyse:
this function work very well ONLY IF word is not running
"C:\Program Files\PDFCreator\PDFCreator.exe" -NoStart -PF"D:\mywpdata\WorkManager.doc"

if the client already work with word and try to convert an other .doc in pdf (using this cmd line) we see that pdfcreator change the current printer to pdfcretor (OK), then before lauching the new document to convert it switch back to old printer driver, THEN try to convert the .doc but unfortunately directly on the physical printer !

if the customer quit all word instance and repeat the same action, then all work OK, the printing process occur before switching back to physical printer using the good PDFCreator printer driver.

If you have any idea, thanks a lot !