Stack size limit for If/Then statements?

[SMcNeill]

Note that you *may* be running into the c++ limit if you're compiling with a 32-bit version of QB64PE.  The memory usage went up rather high in my tests, getting close to the 2GB memory mark, and if your lines are longer and more complex than mine, then I wouldn't be the least bit surprised if it isn't trying to use over 2GB of memory to compile -- and thus is erroring out when it hits the hard limit of a 32-bit program.

Does it do the same if you try and compile on a 64-bit version of QB64PE?  You may be hitting 32-bit limits and not any sort of limit in the language itself.