Having the same problem- using QBO for years and have not been able to print a check for months- even on a new printer.  When I went to install the most recent version of Reader, I was then linked to a page that said the only browser that will support the Reader plug-in is Internet Explorer.  This makes no sense.  There has to be a work around.  Paying $50+ per month on accounting software and can't print a check????  Super frustrating and none of the company replies below seem helpful- just making you connect with a human when clearing this is a big problem.