Running R5 in Xandros 3.02/CX 4.1, I've used the clipboard pretty successfully to bring data from other applications into R5. Clipboard performance with bundled CX in Xandros versions earlier than this was spotty. In CX 4.1, text with HTML attributes usually was transferred to a Notes RT field as plain text and any graphics or link data in the clipboard contents were ignored as compared to apps running in W2k, where HTML tags were generally preserved in the Notes document.
I've recently installed Xandros 4 with bundled CX 5.0.3 on three machines. Uniformly, when trying to paste clipboard data into an R5 RT field, I get a Lotus Notes error dialog: 'Only text can be pasted into this field.' This occurs in Notes databases I've built and in standard Lotus databases. I've looked at fields in Designer to insure that they were rich text. I've tried copying purely text data from an ASCII editor to insure that it is only text I am trying to paste. I've retested the same databases running in Xandros 3 and W2k and found the paste operation succeeds. I've also done the same tests running Notes 6.5.2 in Xandros 4/CX 5.0.3 and get the error.
My supposition is that the problem lies in some change in CX from 4.1 to 5.x in the way that clipboard data is handled. This doesn't appear to be a CX-wide problem, since I can copy text out of a Notes document and paste it into a Dreamweaver MX document. Perhaps it is some CX clipboard attribute being set in CX 5, different from the way it was handled in CX 4 that is being interpreted differently by Notes when it tries to process the clipboard.
Incidently the same data, for example an HTML document, can be brought into these fields using the import file function and the field handles the data as rich text, replicating all of the HTML tags correctly, so this isn't a problem with the way the field is defined.