Calligra has been rebuilt in -Current in order to built correctly and now it has a complete apps that were missing in the previous update. This rebuilt version also fixed some earlier problems like what's reported by Hitest in LQ.
I have confirmed that this crashing bug do occurred when Calligra 2.4 was introduced in -Current and i can also say that this crash is now fixed after using the rebuilt version.
So, go grab the rebuilt version and taste the new version of Calligra.
I personally like Calligra Flow since it's like MS Visio where we can draw a lot of symbols and notations such as DFD, Logic Gates, Cisco-based networks, and many more. I hope they could improve by adding more standards symbols used for software engineering, such as UML.