Crash upon frequency calculations with range separated bybrid

Questions
#1

I have a simple calculation for H2 (geom optimization + vibrational frequencies) using wB97X-V. The input file is given below. Geom optimization and single point run fine, but in the vibrational frequency analysis, the cade just stops at “Calculating analytic Hessian of the SCF energy”. I am running this through IQmol, so I do not have an further information on the crash. It is not due to runtime, however, as the calculation only runs a few seconds before crashing.
I cannot see anything immediately wrong about the calculation. When changing to B3LYP the calculation runs, so it likely has something to do with the range separation. However, I cannot see any indications in the manual that second derivatives with RSHs should not be possible.
Thank you for your suggestions.

Input:
$molecule
0 1
H -4.2404436 1.9483970 0.0000000
H -3.5329804 1.9208335 0.0000000
$end

$rem
BASIS = def2-TZVPPD
GUI = 2
JOB_TYPE = Optimization
METHOD = wB97X-V
SCF_CONVERGENCE = 8
$end

@@@

$molecule
read
$end

$rem
BASIS = def2-TZVPPD
GUI = 2
JOB_TYPE = SP
METHOD = wB97X-V
SCF_CONVERGENCE = 8
$end

@@@

$molecule
read
$end

$rem
BASIS = def2-TZVPPD
GUI = 2
JOB_TYPE = Frequency
METHOD = wB97X-V
SCF_CONVERGENCE = 8
$end

#2

This is odd. With the latest Q-Chem v. 6.3.1, this job runs normally. With IQmol v. 2.14.0, I reproduce your behavior. The first two jobs run to completion but the third ends with

 Calculating MO derivatives via CPSCF
    1     0     9    0.0512519
    2     0     9    0.0044341
    3     0     9    0.0002693
    4     6     3    0.0000138  
    5     9     0    0.0000002  Converged
 Polarizability Matrix (a.u.)
            1           2           3
    1  -4.9190213   0.0000000   0.0000000
    2   0.0000000  -4.9190213   0.0000000
    3   0.0000000   0.0000000  -6.7433429
 Calculating analytic Hessian of the SCF energy

and apparently sends the data back to IQmol (which feels to me like it probably crashed on Q-Chem’s server but I have no way to diagnose that). Please contact Q-Chem technical support. It looks like the server is still running Q-Chem v. 6.3.0 so maybe(?) this is a bug that was fixed in v. 6.3.1?

Update: I confirmed the same (crashing) behavior with the latest IQmol, v. 3.1.5, no surprise because I think the problem is on the server end. Also confirmed that the job runs successfully through IQmol if the functional is wB97X-D, which is also RSH. I suspect the problem is with the -V functionals, where the 2nd derivative code is more complex. Other RSH functionals may be unaffected.