Selected file: C:\Users\bilst\Documents\B2H2-D.wfn
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Total energy:     -49.827487672747 Hartree,   Virial ratio:  2.01037388
Total/Alpha/Beta electrons:     10.0000      5.0000      5.0000
Net charge:     2.00000    Expected multiplicity:    1
The number of orbitals:     5,  Atoms:      4,  GTFs:     80
This is a restricted closed-shell single-determinant wavefunction
Title line of this file:  [B2H2]++

Loaded C:\Users\bilst\Documents\B2H2-D.wfn successfully!
Formula: H2 B2
Molecule weight:        23.63794 Da

It does not continue to the menu, even if I wait for a couple of minutes. When I, however, add one electron ([H-B-B-H]+; one unpaired electron) and force the molecule to stay linear, it works without problems.

I used Gaussian 16 Rev A.03 and I can analyse other wfn or fchk files from different systems. I even downloaded the latest windows 64 binary from the MultiWNF website - no improvement. For some reasons, there seems to be an issue with the di-cation.