1. 600x800 is ok...but those 2000x3000 are just way too large. You need to size them down because large files like that slow down the server. (yes..IH shrinks them, optimizes them, and serves them up more quickly...but the image must be reasonably sized to start with in order to obtain max performance).
2. From the ReadMe (troubleshooting tab):
Parens ARE special characters and therefore do not belong in file names. Neither do spaces. Use underscores instead. i.e. file_name.jpg
See if making those huge images smaller and renaming your files appropriately doesn't help solve your issues.
Good luck and happy zenning

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