Messed Up Water and Lava Textures

[DoYouEvenLift]

Whenever I enter a world, I'm always greeted with the following line:

ERROR[main]: generate_shader(): failed to generate "bumpmaps_liquids", addHighLevelShaderMaterial failed.

Usually, this doesn't effect my game or what I do in the world, but whenever I go into the Wazuclan server I end up with strange water and lava textures. Like this:
Although, unlike in other servers (where I don't have this issue), whenever I enter the Wazuclan server I get a message telling me I couldn't load the image, "unknown_block.png". I'm not sure whether this is a problem with "unknown_block.png", "bumpmaps_liquids", or something else. Any help would be appreciated. :)

Oh, and I'm using the 4.7 Minetest build on Debian Wheezy 64-bit.

My minetest.conf (if it's of any use).

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address = wazuclan.com
main_menu_tab = multiplayer
name = [InsertNameHere]
port = 30000
server_dedicated = false
enable_3d_clouds = false
enable_particles = true
enable_shaders = true
fast_move = true
liquid_finite = false
main_menu_last_game_idx = 1
mainmenu_last_selected_world = 2
mg_name = v7
mip_map = false
new_style_leaves = true
noclip = true
old_style_mod_selection = true
opaque_water = false
preload_item_visuals = true
public_serverlist = false
selected_world_path = /path/to/world/
server_announce = true
smooth_lighting = true
anisotropic_filter = false
bilinear_filter = false
trilinear_filter = false

[sfan5]

1) Minetest 0.4.7 not 4.7
2) This is not the texture messed up, its the rendering
2.1) https://github.com/minetest/minetest/issues/840

[DoYouEvenLift]

1) Minetest 0.4.7 not 4.7
2) This is not the texture messed up, its the rendering
2.1) https://github.com/minetest/minetest/issues/840

Oops, I messed up on the version number.
.
Anyways, thanks for the feedback, I'm glad to know it is not an OpenGL problem and just a server problem. Hopeful the server gods will fix it.

[PilzAdam]

You got that wrong, its not a server problem but a compatibility problem between a new client and an old server.