Problem with ModIMKPeakOriented!

[paysheen]

I did a dynamic SDOF analysis using the ModIMKPeakOriented material and the results were quite different from what is happening! Bilin material with the same properties gives much more appropriate responses! Is there any bug with this ModIMKPeakOriented in the transient analysis? or it is me that has this issue?

[joolioos]

I have this problem too,
If you find solution, please share with me my friend.