Bug in the Data Lab maybe, or more inside the data structure. While using the data lab to load a spreadsheet of edges, then a spreadsheet of nodes, the node attributes do not correctly load if Gephi has just started.

Way to reproduce:

1. Open a new Gephi instance (latest version of Gephi 0.8beta up-to-date on 16/12/11).
2. Create a new Project.
3. Go to the DataLab.
4. Import edges.csv (check to create the missing nodes)
5. Import nodes.csv (in that order)
   => All the ModularityClass attribute values are not loaded.

This bug does not happen by importing nodes first, nor if you create a new workspace or a new project - it's just after a fresh new start of Gephi.
While creating a plugin connector, I also noticed a similar behavior that some attribute values where missing, but with no ability to reproduce the bug. So the bug may not lie in the code of the Data Lab, but may be related to the data structure itself.
As this leads to fail silently to load the data, this is a very critical bug.

nodes.csv

Id ModularityClass
1 0
2 1
4 2
37 1
3 3
7 2
8 2
29 4
5 2
18 5
6 6
10 7
11 8
14 9
9 7
12 7
13 9
15 10
16 10
19 10
20 10
21 10
17 10
31 5
22 11
23 12
24 12
25 11
26 11
27 13
33 14
28 13
36 14
30 15
34 16
38 4
32 14
39 16
35 16

edges.csv

Source Target
1 2
2 4
2 37
3 7
4 7
4 8
4 29
5 7
5 8
5 18
6 7
7 8
7 10
7 11
8 14
8 18
9 10
9 12
10 12
10 13
11 13
13 14
14 15
15 16
15 18
15 19
15 20
15 21
16 17
16 18
16 19
16 20
17 19
17 21
18 20
18 29
18 31
19 20
19 21
20 21
20 22
20 31
22 23
22 24
22 25
22 26
23 24
25 26
25 27
25 31
25 33
26 27
26 28
27 28
27 36
29 30
29 34
29 38
30 31
30 34
30 37
31 32
31 33
31 34
32 33
32 36
32 39
33 34
33 36
34 35
34 38
34 39
35 39
36 39
37 38
38 39