I'm sorry that DialogPro isn't meeting your search needs! From what we know about the tool, my impression is that it wasn't meant for heavy research. Rather it seems to have been designed for small business users who need occasional access. The lack of search history and results-saving features can definitely be frustrating. If you want to continue your research in Dialog Classic or DialogWeb, you can switch to those platforms if you're ready and willing to learn the Dialog command language. In those tools, you can continue to search databases under your current subscription without incurring any additional charges. Dialog offers good live customer support if you need a quick tutorial.
When I spoke to Dialog representatives at the recent SLA2009 conference, they were adamant that none of the Dialog tools would be retired anytime soon. ProQuest's plans for Dialog seem to be to continue offering the current products while integrating ProQuest CSA content.
If you need to supplement your research further, there are lots of free non-patent databases on the web that might be less frustrating to use. My suggestion would be to check out the Resource Finder tool to see if there's anything a bit easier to use and more responsive that covers the scientific area you need. However, if you need a proprietary database on Dialog, I think you're stuck with the Classic or Web options as the only alternatives.