Are you just using LiveCycle Designer or also a LiveCycle server component?  Depending upon your version and the bugs you are referencing, you may want to try with the latest Designer ES4.

If you are looking to evaluate LiveCycle Designer, you should evaluate the latest release.  Trial download available here:  www.adobe.com/go/trylivecycle_designer

Firefox and Chrome also have built-in PDF Viewers.  You need to use Adobe Reader/Acrobat for PDF's created from XFA forms.  It's likely the browers built-in PDF Viewer is attempting to load the PDF which explains why you are receiving the "Please wait..." message.