I now understand the issue with the red portion and the [x]. That will be fixed soon.
For the page, there was a bug with get params, those killed the output inspector. I fixed those now, it should be better able to fetch pages like http://www.plndr.com/product/browse?a=34714&catId=0&version=.... I was able to extract the product names from there in an example page, just a download block and an extract block selecting `.product-cell .product-title`. If you still have problems, would you please comment again, open a bug on https://github.com/pipes-digital/pipes/issues or send me a mail? Kind of crucial to iron the kinks out.
The parse errors are annoying, but I failed silencing them so far. The XML parser is throwing them regardless of try-catch, I don't know why. But they will be just ignored later on: 'View output' should show the pure html (instead of parsed and highlighted XML) instead. That seemed to work fine so far (but might fail in a different browser than those tested...).