I’ve been editing a report (ReportBuilder 3.0) and was playing about with the positioning for a legend entry on one of the charts.
It let me save the report, but when I ran it in IE it displayed an error in the chart placeholder.
When I went back to ReportBuilder to undo the changes, it crashed on me, and now when I try to reopen the report I get the following error and cannot open the report:
Can anyone advise a way to get the report to open again so that I can edit it please?

Try editing a COPY of the .rdl file using a text editor (I use Notepad++). You could then comment out / remove some of the XML lines that may be causing the error.