[FLASH-USERS] prohibitively small hydro time step following the "after amr_prolong..." warning

[Chaoran Wang]

Hi FLASH users,

I am running a hydrodynamic simulation using FLASH 4.2.2. The code ran for
~17000 steps and seemed fine. However, a warning appears in the output
file:

WARNING after amr_prolong: = PE=111   block=70
 type=2
 location          12           7           9
LARGE      0.5179223E+16   0.1000000E+10  -0.8635091E+01  -0.8395539E-01
 location          11           7           9
...

After it shows up, the hydro time step (dt_hydro) decreases abnormally
(from ~1e11s to 1e-39s within few steps) and the simulation failed to
proceed. Could anyone know the solution to this problem?

Best,
Chaoran
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