The program gets a little buggy where importing and exporting solutions is concerned.
Exporting solutions: Open the solutions window. Highlight a solution. Press page-down to go to the next level, and you can click on Solutions-->Export LuRD *before* highlighting a solution. If you do, you get "Access violation at address 4013D258 in module 'vd60.bpl'. Read of address 00000004."
Importing solutions: This seems to be a feature, not a bug. You cannot import a solution larger than 20k. I get a message from the program telling me the import is larger than 20k and probably isn't a solution -- except that it is. There are a few huge levels that I solved in another program, but I can't import the solution because it's bigger than 20k. But anyway, since a solution can be bigger than 20k, it's incorrect for the program to assume any LuRD bigger than 20k probably isn't a solution.
Sometimes when I import a solution, the program tells me it isn't a valid solution, except that it is. I haven't figured out what the common factor is when this happens. Sometimes I can import it by copying all but the last few moves. Sometimes only half the solution can be imported. This typically happens with large levels, but not necessarily. I'm wondering if it has anything to do with lines more than 256 characters long.
Sometimes I get an access violation when importing a solution. I'll try to pay more attention next time that happens to give you more details on when it happens.
That's it for now...