Messy visualization after TCGA dataset when opened using File/Open menu

[assaron]

Steps to reproduce:

1. Open any example dataset (say, gene expresion for Acute Myeloid Leukemia).
2. Open File/Open menu. Go to preloaded tab.
3. Open any example dataset, again could be AML.

The heatmap doesn't look as neatly, as when opened from the start page.