Can't save or compile package (insufficient memory)

When I compile or save a SSiS package in the SQL Server Business Intelligence Development Studio I get the error

Failure saving package. (Microsoft Visual Studio)

Insufficient memory to continue the execution of the program.

Sometimes, if I wait longer time, the package can suddenly be saved.

I have 2 GB of RAM und over 15 GB of free space on my disk. Thus, there should be anough space to save the package.

What should I do to resolve this problem? It seems to be a bug.

To splitt the package would not be a solution.

How large is the package, and what version of Visual Studio are you running?