Private windows become unavailable on retiring and joining a

Model Acer Aspire E1-771
OS Windows 8.1
CPU Intel Core i5 323DM 2.6GHz
Memory 4GB
Video Intel HD Graphics 4000
Vassal 3.2.15
Java Version 8 Update 45

Not sure if I am doing something wrong, or if this is expected behaviour, or a bug.

A module has 5 defined sides (A, B, C, observer and solitaire).

The module has three Private Windows defined as belonging to:

Player A, Solitaire and Observer
Player B, Solitaire and Observer
Player C, Solitaire and Observer

When a player retires and “joins another side” none of the Private windows can be accessed by him.