Everytime that i try loading a file that used to have a timeline, it loses all the content from it. I lost all of my projects that made so far, i can't create nothing reliably, everytime that i open a file, it changes in some way.

Also, while trying to create a new emitter, having a project with timeline and a few keyframes, i got a crash. 

___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of Other Event: User Defined 0
for object objParticle:

lerp argument 2 incorrect type (undefined) expecting a Number (YYGR)
at gml_Object_objParticle_Other_10
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Object_objParticle_Other_10 (line -1)
called from - gml_Script_create_particle (line -1) - <unknown source line>
gml_Object_control_Particles_Step_1

Using the last version (1.1.5.4)?   Also Win(7, 8 10) or Mac? It happens always? Which are the exact steps to reproduce it?

Windows 10, steam version, on latest. If i create a project with more than one emitter using the timeline with a lot of keyframes, the Keyframes are not persistant, if i save the project and open it back up loading it up, it loses the visual information (the sprite) of the keyframes and some configurations.

Hi there,

I've been testing that and indeed it seems to be a problem when saving/loading (I'm not sure which one causes the bug) that doesn't affect the first keyframe of the animation properly. I've added it to the todo list to be fixed in the next version. Thanks for the report.