# so many crashes with VRay + FP combo in IPR

**URL:** <https://forums.chaos.com/t/so-many-crashes-with-vray-fp-combo-in-ipr/114505>\
**Category:** Issues\
**Created:** [March 31, 2023, 8:12am UTC](https://forums.chaos.com/t/so-many-crashes-with-vray-fp-combo-in-ipr/114505 "2023-03-31T08:12:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jiri.Matys](https://avatars.discourse-cdn.com/v4/letter/j/f14d63/32.png) [@Jiri.Matys](https://forums.chaos.com/u/Jiri.Matys)\
**Post date:** [March 31, 2023, 8:12am UTC](https://forums.chaos.com/t/so-many-crashes-with-vray-fp-combo-in-ipr/114505/1 "2023-03-31T08:12:25Z")

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Hi,

I am using 3ds max 2023 with latest VRay and Forest Pack. But when I use IPR and modifying material of FP object in slate while IPR is running, I got close whole max without any warning after some material modification. So I cant use IPR because dont know if crash after second or fifth modify. Really terrible, can this be solved somehow please?

Thank you.

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**Author:** ![Joelaff](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/joelaff/32/71647_2.png) [@Joelaff](https://forums.chaos.com/u/Joelaff)\
**Post date:** [March 31, 2023, 9:31pm UTC](https://forums.chaos.com/t/so-many-crashes-with-vray-fp-combo-in-ipr/114505/2 "2023-03-31T21:31:56Z")

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I had some weird crashing issue with FP where I had to duplicate (copy) my FP.. Then things worked if I hid the original version. However, if I deleted the original FP the crashes would come back. Maybe try duplicating your FP and keeping the copy but hiding it.

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**Author:** ![s\_gru](https://avatars.discourse-cdn.com/v4/letter/s/f19dbf/32.png) [@s\_gru](https://forums.chaos.com/u/s_gru)\
**Post date:** [April 1, 2023, 9:44pm UTC](https://forums.chaos.com/t/so-many-crashes-with-vray-fp-combo-in-ipr/114505/3 "2023-04-01T21:44:41Z")

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i’ve had crashes with IPR and Forest for a long time now. v8.0.6 in forest pack right now and can’t upgrade to anything newer b/c my license got switched. i just installed vray 61004. not sure if that helped me? anyway the problem happens with me when adjusting anything even other materials not assigned to FP. or starting/stopping IPR several times in a row. my only solution so far is to turn off the FP objects do IPR for other adjustment then be ultra careful with adjustments in any FP objects, then crash anyway.

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<div class="post-metadata">

**Author:** ![Joelaff](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/joelaff/32/71647_2.png) [@Joelaff](https://forums.chaos.com/u/Joelaff)\
**Post date:** [April 1, 2023, 11:54pm UTC](https://forums.chaos.com/t/so-many-crashes-with-vray-fp-combo-in-ipr/114505/4 "2023-04-01T23:54:58Z")

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That was what I ran into when I found that copying the FP object and turning off the original fixed it, so long as I didn’t delete the original.