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A rather nasty issue evaded our testing and found its way into IDA 7.6: using the PyQt5 modules that are shipped with IDA, QTreeView (or QTreeWidget) instances will always fail to display contents.

E.g., the following script

from PyQt5 import QtWidgets

tree = QtWidgets.QTreeWidget()
item = QtWidgets.QTreeWidgetItem()
item.setText(0, "Test col#0")
tree.addTopLevelItem(item)
tree.show()

used to render like so:

but now looks like this:

The fix

In order to solve this, please download the fix corresponding to your IDA installation, and replace the original QtWidgets DLL with the one contained in the .zip file