BuddyPress.org

How did you fix it?

you didn’t say what theme you are using?

are ‘pretty permalinks’ enabled?

https://codex.buddypress.org/getting-started/before-installing/

Did you install wordpress, or buddypress, from a webhosts built in installer/script or did you do the normal manual install?

Either way it may be a case of needing to re-install as a/some files may be missing… this can happen with ftp errors….

Blank white screen?
If so see: https://codex.buddypress.org/troubleshooting/blank-pages/

What theme are you using?
Does the crash come with an error message and if so what.
What plugins are you using….

It might possibly help to have other information as suggested here:
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/when-asking-for-support/#post-14652

Suffusion has it’s own compatibility pack https://buddypress.org/community/groups/suffusion-buddypress-pack/ ….?

Could you explain further what you mean as it’s not clear…. such as which image or what button…
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/when-asking-for-support/#post-14652

I’m glad it’s sorted.

Have you integrated buddypress?

https://codex.buddypress.org/theme-development/wordpress-to-buddypress-theme/

https://codex.buddypress.org/theme-development/bp-template-pack-walkthrough-level-easy-2/

BuddyPress Template Pack 1.1

You need to set up apache webserver, php programming language and mysql database.

Some people use prepackaged setups such as xampp which include all three of the above.

Personally I prefer to install everything separately.

Either way it is all free.

Afterwards you will probably need to setup email for the above.

You probably need more memory…..

wp in multisite/multi-user mode is for multiple blogs on the same installation, if that’s what you mean…

https://codex.wordpress.org/Create_A_Network

EDIT: darn it – beaten to it by moments….

You appear to have run out of memory…

It’s possible that the server isn’t sending any mail….

Some web hosting services need an extra plugin to send mail. I have successfully used: https://wordpress.org/extend/plugins/wp-mail-smtp/ but there are others.

https://codex.buddypress.org/extending-buddypress/changing-internal-configuration-settings/

?

Examine it in Firefox Firebug (add on), internet explorer developer tools (built into v 8 & 9) or equivalent for other browswers, to find the right css to edit?