I'm running SQLyog 3.71 (trial version). I have to say it is a major relief after using MySQL's query browser. There might be a possible issue with copying data to clipboard.
After running a query select the resultset and right click on the grid cell. Select option- “copy data to clip board”. Upon choosing this option, you'll be prompted with another dialog box (to specify the escape characters). Uncheck for both …'escape by' and 'line terminated by'. If you leave the radio button 'variable length' enabled then the last character of the result set will chopped up. Example: let's say my result is 1394101. After repeating above steps, if you paste this data into excel, the value will be 139410.
Thanks