PDF Pack: just need to combine some files; "combine" button is grayed out and unresponsive I purchased PDF Pack solely to be able to combine PDF files. I understand that with my plan, this can only be done on the browser and not in the desktop app. However, I am being prevented from combining files at this link. I have tried the link on multiple browsers. I have signed out of my account, cleared my cache and cookies, and signed back in. I have tried combining a wide variety of documents, not just the ones I need to combine for my job. My OS is up-to-date. I tried everything the forums suggested, to no avail. I tried everything that the tech support chat person suggested, again to no avail, and was told to go to the forums.I just need to get the "combine" button to be blue and not gray.